[TOPIC-GPIO] drivers: eeprom_at2x: update for new GPIO API

[pabigot]

Document and assign write-protect signal as active low, and use the
active-sensitive API to control it.

Signed-off-by: Peter Bigot [email protected]

[zephyrbot]

All checks passed.

checkpatch (informational only, not a failure)

-:59: WARNING:LONG_LINE: line over 80 characters
#59: FILE: drivers/eeprom/eeprom_at2x.c:520:
+					 GPIO_OUTPUT_ACTIVE | config->wp_gpio_flags);

- total: 0 errors, 1 warnings, 150 lines checked

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[henrikbrixandersen]

These are just default values in case no WP pin is set in DTS. They can remain as 0 or GPIO_ACTIVE_LOW. Their value is not used. It is just to satisfy the C macro for generating the device instance.